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Old 10 August 2009, 17:29   #1
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520 Rib Advise

Hello Ribsters

Old sib user but new to rib world, will need your expertise on these tech issues :

1-If planning to install a skier U ring on transom to place ski rope which side would be ideal to install : left or right as seen from rear transom, engine is a 60 HP counter rotating engine/prop. A ski pole placed on middle rib transom will not be used.

2-To get best skier/hole shot performance :
-Stay with medium pitch prop factory delivered
-Perform WOT test, go for max engine rpm allowed and change prop to match wot.
-Ideal crew : skier, driver, copilot in bow or just 2, skier & driver ?

3-Rib configuration :
Central console/ 520 with 60 HP, 2 strokes, 20 tail
max engine permitted 75/80 HP (2 strokes) so 15/20 HP less top engine.
What comes immediately after a Yam 60 HP (2T) model ?

4-Gasoline Tanks:
Which is better, 6 gallons on central console or 15 gallons internal tank, probably at transom or under central console (data is not available at this moment) which combination tank type/ski crew will balance rib properly ?

Short answers will be highly appreciated.

Happy Ribbing
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Old 10 August 2009, 18:09   #2
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Quote:
Originally Posted by Locozodiac View Post
1-If planning to install a skier U ring on transom to place ski rope which side would be ideal to install : left or right as seen from rear transom, engine is a 60 HP counter rotating engine/prop. A ski pole placed on middle rib transom will not be used.
I think it is normal to fit both and use a "bridle" between them to "centralise" the pull.
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Old 11 August 2009, 15:23   #3
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ski u rings

hi mate , put a u ski ring on both sides of transom then the rope won,t catch the engine when turning
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Old 12 August 2009, 11:48   #4
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Originally Posted by Locozodiac View Post
2-To get best skier/hole shot performance :
-Stay with medium pitch prop factory delivered
-Perform WOT test, go for max engine rpm allowed and change prop to match wot.
-Ideal crew : skier, driver, copilot in bow or just 2, skier & driver ?
A 4-blade prop selected for WOT rpm would give you a better hole shot than a 3 blade, at the expense of a bit of top end speed. Selecting for a slightly higher than recommended rpm will give a better still hole shot, but you'll have to be careful about running WOT with no load.

In the US, you'd be illegal running with just a skier and a driver. Requirement is driver, spotter, skier. Don't know about Peru.



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